One of the most successful child actors of all time, Howard started his career long before Happy Days as Opie Taylor on The Andy Griffith Show, but his six-year portrayal of Richie Cunningham is what sealed the deal on his fame.

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NOW: Ron Howard

These days, Howard, who just turned 62, spends more time behind the camera than in front of it. He has directed several successful films, including the Academy Award-winning A Beautiful Mind (2001) and The Da Vinci Code (2006), as well as produced and narrated the cult favorite TV series Arrested Development.

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THEN: Marion Ross

While Ross had appeared in several films prior to Happy Days, playing sweet and loving housewife Marion Cunningham is what she's known best for.

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NOW: Marion Ross

Since playing "Mrs. C," Ross has continued to appear on television and in films, including playing housekeeper Rosie Dunlop in The Evening Star (1996), which was the sequel to Terms of Endearment (1983). She was nominated a Golden Globe for Best Supporting Actress for that role.

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THEN: Tom Bosley

The family's stern and traditional, yet wise and forgiving, father-figure Howard Cunningham was portrayed by stage, television, and film actor Tom Bosley. Fun fact: Bosley appeared in all 255 episodes of Happy Days, making him just one of of two actors to do so (the other being Henry Winkler).

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2010: Tom Bosley

After the end of Happy Days, Bosley continued acting for years, even reprising his role as Howard Cunningham on Family Guy in 2005. Sadly, he passed away due to complications from a staph infection in 2010 at age 83. He was survived by his wife of 30 years, actress Patricia Carr, and Amy Baer, his daughter with ex-wife Jean Eliot.

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THEN: Erin Moran

Adorably troublesome Joanie Cunningham was portrayed by fresh-faced child actress Erin Moran, who was just 13 when the show first aired.

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NOW: Erin Moran

Moran took Joanie to the short-lived spin-off Joanie Loves Chachi, but the series lasted just a year and she returned to Happy Days for the show's final season. Years later in 2008, she appeared on VH1's reality fitness show, Celebrity Fit Club.

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THEN: Henry Winkler

Not only did Winkler woo the world via his cool onscreen persona Arthur "Fonzie" Fonzarelli, but he also garnered admiration through compassion to his fans. Legend has it that he regularly answered letters and made phone calls to let them know he appreciated their support.

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NOW: Henry Winkler

Winkler has continued to enjoy a strong acting career, appearing in films like Scream (1996) and television shows including Law and Order: SVU, Bob's Burgers, and (of course) the Ron Howard-produced hit Arrested Development. On top of his acting exploits, Winkler has written a successful series of children books about Hank Zipzer, a little boy with dyslexia, in response to Winkler's own lifelong struggle with a learning disability.

Williams continued to work in the entertainment industry as a director and producer, directing episodes for numerous TV series. He also appeared as himself in an episode of Boy Meets World themed after Happy Days alongside former cast mates Tom Bosley and Pat Morita.

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THEN: Don Most

This lovable redhead played goofy prankster Ralph Malph, whose antics (including his inclination to chase after girls) were the center of many an episode's debacles.

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NOW: Don Most

After appearing on seven seasons of Happy Days, Most guest starred on numerous shows, including The Love Boat, Star Trek: Voyager, and even Glee. Though his hair is no longer a fiery shade of red, he's still got that same great grin.

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THEN: Scott Baio

As the younger cousin of cool guy Arthur Fonzarelli, it was only natural that Chachi would be a popular figure on the show. In fact, Baio received up to 5,000 letters per week from fans, leading writers to give him a bigger part.

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NOW: Scott Baio

While the Joanie Loves Chachi spin-off didn't work out, Baio continued acting, appearing on Full House and The Nanny as well as starring in his own 2007 VH1 reality series, Scott Baio Is 45...and Single. But we all likely remember him for his biggest role on Charles in Charge, which aired for most of the 80s.

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